摘要
针对三相光伏并网逆变系统中,电流闭环矢量控制动态响应慢,直接功率控制开关频率不固定的缺点,通过对瞬时功率理论进行分析,结合以上两种控制策略的优点,提出一种定开关频率下的准直接功率控制策略。该控制策略具有动态响应快、开关频率固定和电流正弦度高的优点。实验结果表明该控制策略正确、有效,且具有良好的静、动态特性。
For three-phase photovoltaic grid-connected inverter system, the dynamic of the current closed-loop vector control respond slowly, the switching frequency of direct power control is unfixed.Through the analysis of the instantaneous power theory and combined with the advantages of the above two control strategies, a fixed switching frequency of the quasi direct power control strategy is proposed.The control strategy has the advantages of fast dynamic response, fixed switching frequency and higher sine of current.The experimental results verify the correctness and validity of the control strategy, and good static and dynamic characteristics are presented.
出处
《电力电子技术》
CSCD
北大核心
2013年第9期16-18,共3页
Power Electronics
关键词
并网逆变器
三电平
虚拟磁链
准直接功率控制
grid-connected inverter
three-level
virtual flux
quasi direct power control
